Mapping the Benefits of Tropical Coastal Ecosystems : Economic Value and Qualitative Insights for Socio-Economic Cost-Benefit Analyses

This report offers an overview of the ecosystem services provided by tropical coastal ecosystems in Eastern Africa, including the Indian Ocean islands along its coast, and Southeast Asia. It focuses on mangroves and coral reefs, categorising, quantifying, and, where feasible, monetising their ecosystem services, which are summarised in an inventory table. The methodology employed combines a thorough literature review with expert elicitation, emphasising the application of Socio-economic Cost-Benefit Analysis (SCBA) to determine relevant parameters for assessing the economic values of these services. The research utilised benefit value transfer techniques to complete the quantification and monetisation of identified benefits based on existing studies. Key findings reveal significant economic impacts: for instance, mangroves and coral reefs collectively prevent approximately US $1 billion annually in flood damages. In Southeast Asia, coral reefs contribute an estimated US $2.4 billion annually of fishery revenues. Furthermore, the study highlights gaps in the valuation of certain services, particularly cultural services. These services provide essential human welfare benefits, including mental and physical well-being for communities residing near these ecosystems. Cultural services encompass symbolic and inspirational values, recreational opportunities, visual amenities, and educational resources, which also serve as sources of entertainment.